 He represented the Ohio State Anti-Slavery Society as a delegate to the 1843 World Anti-Slavery Convention in London, England and was elected its American vice president.In early October 1845, in Cincinnati, Ohio, Blanchard debated the morality of slavery with fellow Presbyterian minister Nathan Lewis Rice (December 29, 1807 - June 11, 1877).This debate was recorded in full, and later published as "A Debate on Slavery Held in the City of Cincinnati" (Cincinnati